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– Combined events

– Mutually exclusive events

– Experimental probability

– Independent events and tree diagrams

– Conditional probability

– Venn diagrams and set notation

Example Key Words


The likelihood or chance of a given event happening. Often expressed as a fraction, decimal or percentage.

Experimental Probability

A calculation obtained from an experiment.

Venn Diagram

A diagram that represents sets and shows where those sets intersect.

Probability Tree Diagram

A tree diagram is used to determine and visualise all the outcomes and probabilities of 2 or more events

Mutually Exclusive

A and B are mutually exclusive events if they cannot occur at the same time. This means that A and B do not share any outcomes

Independent Events

Two events are independent if the occurrence of one event does not affect the chances of the occurrence of the other event.